linux-kernel - RE: [PATCH 1/4] dt-bindings: iio: dac: Add adi,ltc2664.yaml

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Date: Tue, 16 Apr 2024 14:16:22 +0000
From: "Paller, Kim Seer" <KimSeer.Paller@...log.com>
To: Jonathan Cameron <jic23@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>
CC: "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lars-Peter
 Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Liam
 Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        David
 Lechner <dlechner@...libre.com>,
        "Hennerich, Michael"
	<Michael.Hennerich@...log.com>
Subject: RE: [PATCH 1/4] dt-bindings: iio: dac: Add adi,ltc2664.yaml

> -----Original Message-----
> From: Jonathan Cameron <jic23@...nel.org>
> Sent: Saturday, April 13, 2024 10:55 PM
> To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: Paller, Kim Seer <KimSeer.Paller@...log.com>; linux-iio@...r.kernel.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Lars-Peter Clausen
> <lars@...afoo.de>; Rob Herring <robh@...nel.org>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley <conor+dt@...nel.org>;
> Liam Girdwood <lgirdwood@...il.com>; Mark Brown <broonie@...nel.org>;
> David Lechner <dlechner@...libre.com>; Hennerich, Michael
> <Michael.Hennerich@...log.com>
> Subject: Re: [PATCH 1/4] dt-bindings: iio: dac: Add adi,ltc2664.yaml
> 
> [External]
> 
> On Fri, 12 Apr 2024 07:50:17 +0200
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> 
> > On 12/04/2024 05:20, Kim Seer Paller wrote:
> > > Add documentation for ltc2664 and ltc2672.
> > >
> > > Co-developed-by: Michael Hennerich <michael.hennerich@...log.com>
> > > Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
> > > Signed-off-by: Kim Seer Paller <kimseer.paller@...log.com>
> > > ---
> > >  .../bindings/iio/dac/adi,ltc2664.yaml         | 230 ++++++++++++++++++
> > >  MAINTAINERS                                   |   8 +
> > >  2 files changed, 238 insertions(+)
> > >  create mode 100644
> Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
> b/Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
> > > new file mode 100644
> > > index 000000000..2f581a9e5
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
> > > @@ -0,0 +1,230 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id:
> https://urldefense.com/v3/__http://devicetree.org/schemas/iio/dac/adi,ltc266
> 4.yaml*__;Iw!!A3Ni8CS0y2Y!8SuDinm690wjc8X5Et94jlV57PAZ79hvsp-
> HRohSvdY5z62lyNXyu4M3R3-BB2PFIqkKsHeFoEJPZzJTgQ$
> > > +$schema: https://urldefense.com/v3/__http://devicetree.org/meta-
> schemas/core.yaml*__;Iw!!A3Ni8CS0y2Y!8SuDinm690wjc8X5Et94jlV57PAZ79h
> vsp-HRohSvdY5z62lyNXyu4M3R3-BB2PFIqkKsHeFoEIk1jpsTw$
> > > +
> > > +title: Analog Devices LTC2664 and LTC2672 DAC
> > > +
> > > +maintainers:
> > > +  - Michael Hennerich <michael.hennerich@...log.com>
> > > +  - Kim Seer Paller <kimseer.paller@...log.com>
> > > +
> > > +description: |
> > > +  Analog Devices LTC2664 4 channel, 16 bit, +-10V DAC
> > > +  Analog Devices LTC2672 5 channel, 16 bit, 300mA DAC
> > > +  https://www.analog.com/media/en/technical-documentation/data-
> sheets/ltc2664.pdf
> > > +  https://www.analog.com/media/en/technical-documentation/data-
> sheets/ltc2672.pdf
> > > +
> > > +$defs:
> > > +  toggle-operation:
> > > +    type: object
> > > +    description: Toggle mode channel setting.
> > > +
> > > +    properties:
> > > +      reg:
> > > +        description: Channel number.
> > > +        minimum: 0
> > > +        maximum: 4
> > > +
> > > +      adi,toggle-mode:
> > > +        description:
> > > +          Set the channel as a toggle enabled channel. Toggle operation
> enables
> > > +          fast switching of a DAC output between two different DAC codes
> without
> > > +          any SPI transaction.
> > > +        type: boolean
> > > +
> > > +patternProperties:
> > > +  "^channel@[0-4]$":
> > > +    type: object
> >
> > patternProps go after properties.  You miss additionalProperties: false
> > and actual properties defined in top-level part of the binding.
> >
> > I wouldn't call your schema easiest to read. You have two quite
> > different devices.
> 
> I agree entirely. I think it might be simpler to have 2 bindings.
> If you haven't already tried that give it a go.
> 
> Note that we can have 2 bindings that in Linux are handled by one
> driver (examples already exist max1363 and max1238 IIRC) as well as
> the other way around where we have one binding and 2 drivers.

Having 2 separate bindings would simplify the implementation. I will proceed
with trying out this approach

Thanks,
Kim